Convert a String to Float

#include <stdio.h>
#include <stdint.h>

float custom_atof(const char *str) {
    int i = 0;
    float sign = 1.0;
    if (str[0] == '+') i = 1;
    if (str[0] == '-') {
        sign = -1.0;
        i = 1;
    }

    float out = 0.0;
    bool dot_found = false;
    int num_decimal = 0;

    while (str[i] != '\0') {
        if (str[i] == '.') {
            dot_found = true;
            num_decimal = 1;
        } else {
            float digit = (float)(str[i] - '0');
            if (!dot_found) {
                out *= 10.0;
                out += digit;
            } else {
                for (int j = 0; j < num_decimal; j++) {
                    digit /= 10.0;
                }
                out += digit;
                num_decimal++;
            }
        }
        i++;
    }

    return out * sign;
}

int main() {
    char str[101];
    fgets(str, sizeof(str), stdin);

    // Remove newline
    uint8_t i = 0;
    while (str[i]) {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    float value = custom_atof(str);
    printf("%.2f", value);
    return 0;
}